前言

Centos8已经废弃了network.service,请使用nmcli

内容

[root@localhost ~]# nmcli --help
Usage: nmcli [OPTIONS] OBJECT { COMMAND | help }

OPTIONS
  -a, --ask                                ask for missing parameters
  -c, --colors auto|yes|no                 whether to use colors in output
  -e, --escape yes|no                      escape columns separators in values
  -f, --fields <field,...>|all|common      specify fields to output
  -g, --get-values <field,...>|all|common  shortcut for -m tabular -t -f
  -h, --help                               print this help
  -m, --mode tabular|multiline             output mode
  -o, --overview                           overview mode
  -p, --pretty                             pretty output
  -s, --show-secrets                       allow displaying passwords
  -t, --terse                              terse output
  -v, --version                            show program version
  -w, --wait <seconds>                     set timeout waiting for finishing operations

OBJECT
  g[eneral]       NetworkManager‘s general status and operations
  n[etworking]    overall networking control
  r[adio]         NetworkManager radio switches
  c[onnection]    NetworkManager‘s connections
  d[evice]        devices managed by NetworkManager
  a[gent]         NetworkManager secret agent or polkit agent
  m[onitor]       monitor NetworkManager changes

命令详解

1. 使用nmcli重新回载网络配置

# nmcli c reload

2. 打开网卡

# nmcli c up <网卡>

2. 查看网卡信息

# nmcli con 
NAME   UUID                                  TYPE      DEVICE 
ens33  36a7b552-ab17-4b2d-afd9-de96c6c935eb  ethernet  ens33 

3. 显示具体的网络接口信息

# nmcli connection show xxx

4. 显示所有活动连接

# nmcli connection show --active

5. 删除一个网卡连接

# nmcli connection delete xxx

6. 给xxx添加一个IP（IPADDR）

# nmcli connection modify xxx ipv4.addresses 192.168.0.51

7. 给xxx添加一个子网掩码（NETMASK）

# nmcli connection modify xxx ipv4.addresses 192.168.0.51/24

8. IP获取方式设置成手动（BOOTPROTO=static/none）

# nmcli connection modify xxx ipv4.method manual

9. 添加一个ipv4

# nmcli connection modify xxx +ipv4.addresses 192.168.0.51/24

10. 删除一个ipv4

# nmcli connection modify xxx -ipv4.addresses 192.168.0.51/24

11. 添加DNS

# nmcli connection modify xxx ipv4.dns 114.114.114.114

12. 删除DNS

# nmcli connection modify xxx -ipv4.dns 114.114.114.114

13. 添加一个网关（GATEWAY）

# nmcli connection modify xxx ipv4.gateway 192.168.0.1

14. 网关和DNS一起写入

# nmcli connection modify xxx ipv4.dns 114.114.114.114 ipv4.gateway 192.168.0.1